Homemade Water Filter. DIY water filtration. simple design. needed: plastic bottle, sand, gravel. small piece of cotton and activated carbon (can be found at walmart/pet stores and wherever aquarium supplies are sold). filter should last 2 to 4 weeks before you have to change carbon. remember to rinse activated carbon before using it (or water will have a blackish color). when SHTF in an emergency be ready.

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